Roles of Slip Agent in Blown Film Extrusion of Linear Low Density Polyethylene

In this work, the effects of different contents of slip agent (0, 800, 1,000, 1,200 and 1,500 ppm) on the surface friction and tensile properties of Linear Low Density Polyethylene (LLDPE) films were investigated. The mixture of LLDPE and slip agent was first compounded and palletised using twin screw extruder and subsequently processed into film using extrude blow film machine. Coefficient of friction (COF), tensile strength, elongation at break, Young s modulus and gel count of the produced film were investigated. It was found that COF, tensile strength and Young s modulus decreased with increase in contents of slip agent but the elongation at break was found to slightly increase. It was also found that the gel count increased as the contents of slip agent increased which might be due to remaining slip agent or contamination in the materials.